Hydrazine is used as an oxygen scavenger in industry and has been found to have wide applications as an antioxidant, a photographic developer and an insecticide . It is also used as a fuel in fuel cells due to its high capacity and lack of contamination. In addition, hydrazine is very important in pharmacology because it has been recognized as a carcinogenic and hepatotoxic substance, which affects liver and brain glutathione. Adverse health effects on people living near hazardous waste sites caused by hydrazine and its derivatives have been described in the literature and the maximum recommended level of hydrazine in trade effluents is 1?g mL –1 . In this work, we describe quantitative determination of hydrazine using voltammetric method at a poly tiron multiwall carbon nanotubes modified glassy carbon electrode surface. Hydrazine does not show a measurable oxidation peak on bare GCE, however cyclic voltammetry of hydrazine at poly tiron multiwall carbon nanotubes modified glassy carbon electrode surface shows enhanced electrooxidation signals. The suitable electronic properties of MWCNTs suggest that they have the ability to promote charge transfer reaction when used as an electrode. Under the optimum conditions at pH 8.0, linear sweep currents increased in the ranges of 10-3540 µmol L-1.the detection limit for hydrazine is 1.8 µmol L -1 .the proposed method was applied to determine hydrazine in real samples. In the second part A sensitive and selective electrochemical method for the determination of hydrazine was developed using a p -aminophenol modified multi-wall carbon nanotubes paste electrode ( p -APMWCNTPE). The modified electrode exhibited good electrocatalytic activity for electrochemical oxidation of hydrazine in the pH 7.00 phosphate buffer solution (). The diffusion coefficient (D=8.0×10 -5 cm 2 s -1 ), and the kinetic parameter such as the electron transfer coefficient (?=0.66) of hydrazine at the surface of p -APMWCNTPE were determined using electrochemical approaches. The catalytic oxidation peak currents showed a linear dependence on the hydrazine concentration and a linear analytical curve was obtained in the range of 0.5-175?M of HZ with a correlation coefficient of 0.9975. The detection limit (S/N=3) was estimated to be 0.3The RSD% for 0.7 and 5.0 µMHZ were 1.1 and 1.7%, respectively. The modified electrode showed good sensitivity, selectivity, and stability. It was successfully applied for the determination of HZ in real samples.